Type printing telegraph apparatus



July 14, 1931. H. WUS TENEY 1, ,2 5 I 7 TYPE PRINTING TELEGRAPH APPARATUS F iled Oct. 2, 1929 m H a MN A W ATTp/PME-YS.

Patented July 1.4, 1931 ,x gn eras Parr.

T, OFFICE SIEMENS & HALSKE, AKTIENGESELLSCHAFT, OF SIEMENSSTADT, NEAR rnntm,,.

GERMANY, A CORPORATION F GERMANY TYPE PEINTING TELEGRAPH .APfARA'I'US Applicationdled October 2, 1929, serial No My invention relates to improvements in type printing telegraph apparatus.

The usual type printing telegraphs employ the same impulse combination for the repro- ,9 duction of two typesbelonging todifi'erent groups, (aletter and a number or a sign) By means of special impulses sent in advance of the said impulse combinations the receiver is set for the reception of letters or numbers and signs. The keys of the keyboard of the transmitter thus carry two characters and there are furthermore provided two changeover keys (generally used simultaneously as spacing keys) for changing the receiver over from letters to numbers and vice-versa.

Since in this arrangement the transmitter has no provisions for indicating whether the receiver is set for letters or numbers and signs, mistakes may easily occur in the transmission particularly in the case of ineXperienced operators. If, for instance, after the transmission of a number the operator omits to actuate-the change-over key for letters, the receiver prints a series of numbers 2| and signs instead of the next word, without the operator becoming aware of the mistake. According to my invention the possibility of committing this mistake is eliminated by a special key being provided for each type and means for locking the transmission of the type not desired at the time. The blocking or locking-out is efl'ected by depressing the letter or the number change-over key and ma for example, be effected by means of a. loc

36 ing bar coordinated to the levers of all the keys and provided. with recesses of such a nature that when depressing a change-over key the key levers corresponding to this key are released and the key levers corresponding to the other groups of types are locked.

In the drawings afiixed to my specification an embodiment of my invention is illustrated by way of example. 5 In the drawings Fig. 1 is a plan of theimproved keyboard, Fig. 2 shows the locking bar in elevation in one position, Fig. 3 the locking bar in another position, 00 and scarce, and. in Germany new as, 1920.

Fig. 4 is a perspective view of the complete operating mechanism.

Referring to Fig. 1 of the drawings showing the improved keyboard, it'will be observed that a separate key is provided for each letter and number or sign. The arrangement of the keys is thus much more similar to the standard typewriter keyboard than hitherto. Below the keys there are located in apparatus with a five current step alphabet, for instance, five bars, not shown in this figure, which are shifted to difierent positions by depressing the keys. There is, however, provided a. further bar according to Figs. 2 and 3, which is adapted to be operated by the change-over keys for letters or numbers and signs. This bar releases in one position, Fig. 2, only the keys for-letters and in the other, Fi 3, only the keys for numbers and signs. T e drawings show that only those keys can be pressed down which correspond to the previously operated change-over kc and thus to the position of the receiver. his mechanism renders mistakes in the transmission of letters or signs entirely impossible even if the appa-' ratus is operated by an inexperienced operator.

Referring to Fi 4 of the drawings, 1 is I one of the selector ars with its contact lever 2 which acts on the set of contacts 3. 4 is the transmitter spindle on which is mounted a cam 5. The key 6 bears a numberand the key 7 a letter. The locking bar 8 according to my invention is located in front of the selector rails 1 and is adapted to be moved from the left to the right by means of the number change-over key 9 and from the right to the left by the letter change-over key 10. In the illustration the bar has been moved into the left-hand position by the depressed letter key 10 and has been locked in this position by the catch 11 engaging a notch in the bar. As will be seen the key bearing the letter B and thus all the other keys bearing letters may now be depressed inasmuchas in the position shown of the locking bar 8 they coincide with the spaces or notches between the teeth of said bar. The keysfi bearing numbers cannot be depressed as they coincide in. the p sigion shown of the bar 8 with the teeth on the I claim as m invention:

1. In a key ard transmitter for type printing tele aphs in which the same transmission sign 1s used for two types belonging to different groups, a separate key for each type, and means for blocking the transmiss ion of the group of types not desired at the 10 time. I

2. In a keyboard transmitter for type printing telegraphs in which the same transmission sign is used for two types belonging to different oups, a separate key for eac 15 t means or blockin the transmission of t e group of types not esired at the time and change-over keys by the operation 0% which the said means is caused to block the p transmission of one or the other group of 30 types. Y

- 3. In a keyboard transmitter for type printing telegraphs in which the same transmission sign is used for two types belonging to difi'erent groups, one'of said groups being as letters, and the other numbers, a separate key and key lever for each type, a slidable bar common to the levers of all the keys and provided with such teeth that in one osition of .the said bar the letter types an in the 0 other sition the number t pes are locked and c ange-over keys by t e operation of which said bar is moved from one position into the other.

4. In a keyboard transmitter for "printing telegraphs, in which the same transmission sign is used for a plurality of difierent types, a separate key for each type, and a blocking device which at any particular time permits the operation of only one of the keys controlling the same transmission sign.

' 5. In a keyboard transmitter for printing tele phs, a plurality of groups of keys contro ing transmission signs, the same sign be-v ing controlled by a plurality of keys each .of

48 which belongs to a different group, and a locking device movable to different positions in any one of which it permits the operation of only such keys as belong to one of said oups while reventing the operation of the 0 e s of the ot er group or. ups.

testimony whereof I my signature.

I HERBERT W'USTENEY. 

